How much Bigen Powder Lightener & Developer do I need?

Bigen Powder Lightener and 20 vol Developer comes in two different size options.  

Individual Size: 1 oz Lightener Packet + 4 oz Developer Bottle

Hair Length	Lightener Needed	Developer Needed
Short Hair	1 packet (1 oz)	½ bottle (2 oz)
Shoulder-Length	2 packets (2 oz total)	1 full bottle (4 oz)

Professional Size: 16 oz Lightener Jar + 32 oz Developer Bottle

Hair Length	Lightener Needed	Developer Needed
Short Hair	1 scoop (1.25 oz)	70 g (2.5 oz)
Shoulder-Length	2 scoops (2.5 oz total)	140 g (5 oz)

Note: If you have thick or long hair, you may need more product than listed above.